EP2192998A1 - Appareil et procédé de détection de ruptures dans des écrans - Google Patents

Appareil et procédé de détection de ruptures dans des écrans

Info

Publication number
EP2192998A1
EP2192998A1 EP08834411A EP08834411A EP2192998A1 EP 2192998 A1 EP2192998 A1 EP 2192998A1 EP 08834411 A EP08834411 A EP 08834411A EP 08834411 A EP08834411 A EP 08834411A EP 2192998 A1 EP2192998 A1 EP 2192998A1
Authority
EP
European Patent Office
Prior art keywords
screen
screening element
detector
housing
detector screening
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP08834411A
Other languages
German (de)
English (en)
Other versions
EP2192998A4 (fr
EP2192998B1 (fr
Inventor
Charles Thomas Bowen
Robert A. Lunnemann
Joachim M. Zaun
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MI LLC
Original Assignee
MI LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MI LLC filed Critical MI LLC
Publication of EP2192998A1 publication Critical patent/EP2192998A1/fr
Publication of EP2192998A4 publication Critical patent/EP2192998A4/fr
Application granted granted Critical
Publication of EP2192998B1 publication Critical patent/EP2192998B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/50—Cleaning
    • B07B1/54—Cleaning with beating devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
    • B07B13/14—Details or accessories
    • B07B13/16—Feed or discharge arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
    • B07B13/14—Details or accessories
    • B07B13/18—Control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
    • B08B7/02—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by distortion, beating, or vibration of the surface to be cleaned

Definitions

  • the field of the present invention is material separation through screening or filtering and break detection for the porous elements employed.
  • Each one typically functions by first introducing a flow of materia! to a porous element such as a screen or filter, usually of woven wire mesh or a porous membrane.
  • the flow of material is separated into two streams, one containing material that passes through the porous element the other containing material that is too large to pass through the porous element.
  • a drive mechanism ma> be operatively coupled with a housing to produce a vibrating motion that serv es to put the material on the porous element in motion until it either passes through or is pushed off the element at the periphery thereof.
  • Other devices use pressure to increase flow through a membrane with cycled application including reverse flow to clear the material that is too large to pass through the membrane.
  • Such separator systems employ screens in rectangular and circular forms with screen elements tensioned on frames or with hooks tensioned on the separator itself.
  • the screen elements range greatly in porosity and can be of a single element or of laminated elements.
  • the separator frames can be vibratory or fixed and. when vibratory, supported by a of means such as springs, bushings or links.
  • Such systems alternatively employ filters, tensioned or untensioned, supported or unsupported and of widely varying porosities and shapes including rectangular, circular, cylindrical and bag shaped.
  • Many additional features are. of course, available such as housing covers, elaborate manifolds and various and changeable motions, rates and cycles. Patents disclosing a small sampling of such systems and components include U.S. Pat. No.
  • Materials typically screened vary considerably in their particle size, bulk density, chemical composition, temperature, moisture content and other physical and chemical characteristics. Any particular separator system in a gi ⁇ en processing plant is likely dedicated to handling a single material with consistent properties. Examples of such materials, to show the diversity but not to provide a comprehensive list, include: abrasives, acth ated carbon, calcium carbonates, ceramic slurries, chlorine compounds, citric acid, fertilizers, flours, food products, gunpowder, minerals, paper coating slurries, pharmaceuticals, pigments, polystyrene beads, powdered metais. powdered paints, printing inks, PVC powder, refractories, rocket propellants, and starches.
  • the disclosed subject matter is generallv directed to an apparatus for detecting a break in a screen of a vibratory separator.
  • the vibratory separator includes a screen secured with in a housing and having a plurality of openings sized for separating material deposited thereon, and a throughs outlet located below the screen for removing material that passes through the screen from the housing.
  • the break detection apparatus includes an infeed section coupled to the housing such that at least a portion of the material passing through the screen and directed from the housing is directed through the in feed section, a detector screening element receiv ing material from the infeed section, wherein the detector screening element has a plurality of openings having a size equal to or slightly larger than the opening size of the screen in the vibratory separator, and a level sensor positioned above the detector screening element, wherein the level sensor is positioned to detect material build up on the detector screening element.
  • the disclosed subject matter is generally directed to a vibrator ⁇ ' separator including a base, a housing elastic-ally mounted to the base, a vibration generator for imparting motion to the housing at an advantageous frequency and amplitude, a screen secured with in the housing and having a plurality of openings sized for separating material deposited thereon, a throughs outlet located below the screen for removing material that passes through the screen from the housing, and a break detector coupled to the housing below the screen for receiving at least a portion of material that passes through the screen in the housing.
  • the break detector includes an infeed section coupled to the housing to receive at least a portion of the material passing through the screen, a detector screening element receiv ing material from the infeed section, wherein the detector screening element has a plurality of openings hav ing a size equal to or slightly larger than the opening size of the screen in the vibratory separator, and a level sensor positioned above the detector screening element, wherein the level sensor is positioned to detect material backup on the detector screening element.
  • the disclosed subject matter is generally directed to a method for detecting a break in a screen of a vibratory separator, wherein the vibratory separator includes a screen secured with in a housing and having a plurality of openings sized for separating material deposited thereon, a vibration generator for imparting motion to the housing, and a throughs outlet located below the screen for removing material that passes through the screen from the housing.
  • the method includes the steps of directing at least a portion of material that passes through the screen to a detector screening element including a detector screening element having a plurality of openings having a size equal to or slightly larger than the opening size of the screen in the vibratory separator, detecting when the material directed to the detector screening element builds up to a predetermined level, and sending a signal in response to the detection of material build up to the predetermined level.
  • FIG. 1 is a cutaway view of a break detection apparatus in accordance with an embodiment of the present disclosure.
  • Figure 2 is a cutaway view of a break detection apparatus in accordance with an embodiment of the present disclosure.
  • Figure 3 is a front view of a vibratory separator including a break detection apparatus in accordance w ith an embodiment of the present disclosure.
  • Figure 4 is a schematic of a break detection apparatus in accordance with an embodiment of the present disclosure.
  • Figure 5 is a schematic of a break detection apparatus in accordance with an embodiment of the present disclosure.
  • embodiments disclosed herein relate to an apparatus and method for detecting breaks in a screen used in a vibratory separator.
  • IVlore specifically embodiments disclosed herein relate to an apparatus and method to detect breaks in sieving screening elements to prevent off-specification product from entering the product flow downstream from a gyratory or vibrating separator.
  • Vibratory separator refers generally to a variety of separators utilizing a screen and motion to separate particles based on size or solids from liquids. Such separators include sifters, shakers, and gyratory separators.
  • a conventional vibratory separator generally- designated 10. is depicted to provide context for a material separation system for detecting breaks in a screening element.
  • Nonvibratory screening systems and filtration systems in a range of such systems described above in the Background of the Invention can also find increased utility with an apparatus and method for detecting breaks in the screening element employed for material separation.
  • the separator 10 includes a housing 12 which is eiastically mounted to a base 14 on springs 16.
  • a vibration generator 18 driven by a motor 20 causes the eiastically mounted housing 12 to vibrate at an advantageous frequency and amplitude for material screening or filtering.
  • a porous element which is a screen 22 in this embodiment, extends across the housing 12 to separate material deposited thereon by selected characteristics.
  • the screen 22 includes a plurality of openings of a predetermined size.
  • the material deposited on the screen 22 may include particles having a size larger than the openings in the screen 22 such that these particles do not fall through the screen 22 so long as there are no breaks in the screen 22. Particles that do not fall through the screen are often called, "overs.”
  • the material deposited on the screen 22 may also include particles having a size smaller than the openings in the screen 22. These particles will fall through the screen and are often called "throughs. " '
  • an overs outlet 24 Above the screen 22 is an overs outlet 24. Particles that remain on top of the screen 22 are vibrated atop the screen 22 until they eventually reach the overs outlet 24 and are directed out of the separator 10.
  • a domed manifold 26 is located below the screen 22. Particles that fall through the screen 22 fall onto the domed manifold 26. Because the domed manifold 26 is higher in the middle and lower at its edge, the throughs slide, bounce, or are otherwise directed towards the outer edge of the domed manifold 26.
  • a throughs outlet may be located through the separator housing 12 near a portion of the edge of the domed manifold 26.
  • the throughs outlet 28 may be a spout located through the housing 12 that directs the throughs out of the separator 10.
  • the tangential spout may include a passage that directs throughs tangential Iy away from the housing. Some spouts may further include a conduit in at art end of the passage through which the throughs are gravity-fed to a collection container or other processing equipment,
  • an apparatus for detecting breaks in a screen is generally referred to herein as a break detector and shown by reference numeral 30.
  • the break detector 30 is disposed in the throughs outlet 28 of the ⁇ ibratory separator 20 in the embodiment shown. It will be appreciated by one of skill in the art that the break detector 30 could be disposed in other types of discharge areas where the finer product (also called '"underflow " ) is collected for discharge, such as a tangential spout discharge chute or discharge collector box.
  • a break detector of the present disclosure may be disposed in a tangential spout used, for example, to remove material that is of a size small enough to pass through a first screen having a first opening size, but too large to avoid passing through a second screen having a second opening size that is smaller than the opening size of the first screen.
  • the break detector 30 may be disposed in a portion of the throughs outlet 28. Thus, not all of the throughs material has to enter the break detector 30.
  • the break detector 30 includes an infeed section 32, a center section 34, and a lower section 36. Material that passes through the screen 22 enters the break detector 30 through the infeed section 32.
  • the infeed section 32 may be coupled to at least a portion of the throughs outlet 28. Alternatively, the infeed section 32 may be coupled to a secondary port near the throughs outlet 28.
  • the in feed section 32 is coupled in a manner known by those of skill in the art, such as a clamping device, threaded fasteners, etc. so that the break detector 30 vibrates with the housing 12 and at the same rate as the housing 12.
  • a baffle fin 46 (shown in Fig. 4) may be installed in throughs outlet 28 to help direct material through the infeed section 32.
  • the baffle fin 46 is helpful when there are low How rates and material needs to be directed to the break detector 30.
  • the baffle fin 46 may be positioned at a different angle relative to the throughs outlet 28 than that shown in Fig. 4 in order to direct a portion of the material towards the break detector 30 while the remaining material continues through the throughs outlet 28 directly.
  • the infeed section 32 may include an orifice plate 38.
  • the orifice plate 38 has a plurality of openings to allow material to pass therethrough. The openings are sized so that the flow of material into the center section 34 is tfirottied and helps reduce the impact of material that is gravity- fed to a detector screening element 40.
  • One or more cleaning elements 42 may be located under the orifice plate 38 to help prevent material from building up on the orifice plate 38.
  • the cleaning elements are retained under the orifice plate such that they can slide or move beneath the orifice plate dislodge any agglomerated or near-hole-sized particles that may plug the openings in the orifice plate.
  • the cleaning elements mav be exciter rings, balls, or any other types of elements as are known in the art.
  • the detector screening element 40 has a plurality of screen openings sized the same as or slightly larger than the openings of the screen 22 in the separator 10.
  • the detector screening element 40 mav have slightly larger openings than the separator screen 22 to ensure that the throughs material continues through element 40 unencumbered and without build up on the detector screening element 40.
  • one or more cleaning elements 42' may be located underneath the detector screening element 40 and that vibrate with the break detector 30 to help prevent material build up on and plugging of the detector screening element 40.
  • the cleaning elements 42 " under detector screening element provide the same purpose as the cleaning elements 42 described with respect to the orifice plate. Further, the cleaning elements 42 " may be exciter rings, balls, or any other elements known in the art. If a detector includes an orifice plate and cleaning elements 42 and 42 * . such cleaning elements 42 and 42' may or may not be the same type of cleaning element.
  • the openings of detector screening element 40 may be larger than the openings of screen 22, care must be taken when selecting the opening size of detector screening element 40 so that the openings are not so large that particles considered more than slightly o ⁇ ersized based on the opening size of screen 22 are unable to pass through the openings in detector screening element 40.
  • the opening size of the detector screening element 40 should be chosen based on several factors so that only slightly oversized particles (relative to the openings of screen 22) are able to pass through detector screening element 40. Factors considered when determining the size of the openings of detector screening element 40 include the opening size of screen 22.
  • the particle size distribution of the material being sorted the flow rate of the material and the type of material.
  • the openings of detector screening element 40 should be sized accordingly.
  • the center section 34 includes a level sensor 44 positioned above the detector screening element 40 and below orifice plate 38.
  • the level sensor 44 is positioned at a predetermined distance above the detector screening element 40. The predetermined distance is determined based upon the amount of build up of material on the detector screening element that is acceptable before such build up is detected.
  • the screen 22 in the separator 10 is intact (without breaks or holes), the material flows efficiently through the detector screening element 40 and is redirected back into the flow of throughs material from the separator 10. During this time, the level sensor 44 does not detect a build-up of material on the detector screening element 40.
  • the level sensor 44 sends a signal in response to the detection of material build up to the predetermined level.
  • the signal may be used to stop the process and/or notify an operator as discussed below.
  • Any type of level sensor 44 which can detect a build up of material may be used, including a proximity sensor.
  • a signal may be sent from the level sensor 44 directly or indirectly to stop the power to the motor 20 driving the vibration generator 18 and interrupt the separation process.
  • Other upstream and/or downstream processing equipment may also be halted in response to the signal from the level sensor.
  • an audible alarm may be activated when a backup of material is detected by the level sensor 44.
  • visual alerts such as lights, warnings on operator monitors, etc.
  • the defective screen in the separator 10 may be replaced with another screen 22.
  • the break detector 30 is disassembled, cleaned, and reassembled so that it can be put back into surveillance with respect to the replaced screen 22.

Landscapes

  • Combined Means For Separation Of Solids (AREA)

Abstract

Un appareil de détection de rupture dans un écran d'un séparateur vibratoire comprend une section d'alimentation couplée au logement de telle sorte qu'au moins une partie du matériau qui passe à travers l'écran et est dirigée à partir du logement, soit dirigée à travers la section d'alimentation ; un élément de criblage de détecteur recevant le matériau à partir de la section d'alimentation, l'élément de criblage détecteur ayant une pluralité d'ouvertures d'une taille égale ou légèrement supérieure à la taille d'ouverture de l'écran dans le séparateur vibratoire ; et un capteur de niveau placé au-dessus de l'élément de criblage détecteur, le capteur de niveau étant placé de manière à détecter une accumulation de matériau sur l'élément de criblage détecteur. Un procédé de détection d'une rupture dans un écran d'un séparateur vibratoire inclut les étapes consistant à diriger au moins une partie du matériau qui passe à travers l'écran vers un élément de criblage détecteur comprenant un élément de criblage détecteur ayant une pluralité d'ouvertures d'une taille égale ou légèrement supérieure à la taille d'ouverture de l'écran dans le séparateur vibratoire ; à détecter le moment où le matériau dirigé vers l'élément de criblage détecteur s'accumule jusqu'à un niveau prédéterminé ; et à envoyer un signal en réponse à la détection de l'accumulation de matériau atteignant le niveau prédéterminé.
EP08834411.4A 2007-09-26 2008-09-26 Appareil et procédé de détection de ruptures dans des écrans Not-in-force EP2192998B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US97542507P 2007-09-26 2007-09-26
PCT/US2008/077861 WO2009042870A1 (fr) 2007-09-26 2008-09-26 Appareil et procédé de détection de ruptures dans des écrans

Publications (3)

Publication Number Publication Date
EP2192998A1 true EP2192998A1 (fr) 2010-06-09
EP2192998A4 EP2192998A4 (fr) 2014-10-29
EP2192998B1 EP2192998B1 (fr) 2016-11-23

Family

ID=40511877

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08834411.4A Not-in-force EP2192998B1 (fr) 2007-09-26 2008-09-26 Appareil et procédé de détection de ruptures dans des écrans

Country Status (4)

Country Link
US (1) US8256309B2 (fr)
EP (1) EP2192998B1 (fr)
CA (1) CA2700885C (fr)
WO (1) WO2009042870A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102327871B (zh) * 2011-09-29 2013-10-30 前进民爆股份有限公司 一种无起爆药雷管引火药倒药筛药机
CN107876386A (zh) * 2017-11-23 2018-04-06 广东嘉俊陶瓷有限公司 筛网传感系统
US11448023B2 (en) * 2019-06-23 2022-09-20 Schlumberger Technology Corporation Screen break detector
CN114377984B (zh) * 2022-01-12 2024-09-20 义乌清越光电科技有限公司 一种屏幕的自动筛选系统

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4334737C1 (de) * 1993-10-12 1995-03-30 Allgaier Werke Kg Verfahren und Vorrichtung zur Kontrolle des Siebgrades einer Siebmaschine
US6585116B1 (en) * 2000-02-22 2003-07-01 Voith Sulzer Paper Technology North America, Inc. Screening apparatus for fiber suspension
WO2004045198A2 (fr) * 2002-11-13 2004-05-27 M-I L.L.C. Systeme et procede de detection de rupture dans des elements poreux pour criblage ou filtrage
US20050107922A1 (en) * 2003-11-17 2005-05-19 Eastman Kodak Company Sieve screen level sensor
ES1065885U (es) * 2007-08-03 2007-11-16 Jose Luis Lopez Barreiro Dispositivo detector de cribas defectuosas en procesos de molienda.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4881051B2 (ja) * 2005-09-16 2012-02-22 株式会社アドバンテスト 導電性流体検出装置用のフィルタユニット及びそれを用いた導電性流体検出装置
US20070163927A1 (en) * 2006-01-05 2007-07-19 M-I L.L.C. Vapor extracting and separator cleaning apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4334737C1 (de) * 1993-10-12 1995-03-30 Allgaier Werke Kg Verfahren und Vorrichtung zur Kontrolle des Siebgrades einer Siebmaschine
US6585116B1 (en) * 2000-02-22 2003-07-01 Voith Sulzer Paper Technology North America, Inc. Screening apparatus for fiber suspension
WO2004045198A2 (fr) * 2002-11-13 2004-05-27 M-I L.L.C. Systeme et procede de detection de rupture dans des elements poreux pour criblage ou filtrage
US20050107922A1 (en) * 2003-11-17 2005-05-19 Eastman Kodak Company Sieve screen level sensor
ES1065885U (es) * 2007-08-03 2007-11-16 Jose Luis Lopez Barreiro Dispositivo detector de cribas defectuosas en procesos de molienda.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2009042870A1 *

Also Published As

Publication number Publication date
EP2192998A4 (fr) 2014-10-29
WO2009042870A1 (fr) 2009-04-02
EP2192998B1 (fr) 2016-11-23
CA2700885A1 (fr) 2009-04-02
US20100192676A1 (en) 2010-08-05
US8256309B2 (en) 2012-09-04
CA2700885C (fr) 2013-12-24

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